Create a large pool of items, randomly divide the items into two seperate tests

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Cronbach's Alpha

Mathematically equivalent to the average of all possible split half estimates

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What does a figure of +0.7 indicate?

indicates acceptable internal reliability

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What is the Kuder Richardson Formula

Measures internal reliability for measures with 2 choices

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External reliability

Test retest reliability, perform the same survey with the same respondents at different points in time

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Inter-rater reliability

Determines the estent to which two or more raters obtain the same result when coding the same response

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Validity

If a test is valid then you measure what you intend to measure

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Content validity

The extent to which a measure represents all faces of the phenomena being measured

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Construct validity

Seeks to establish a clear relationship between the construct at a theoreritcal levela dn the measure that has been developed

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Convergent validity

The measure shows association with measures that it should be related

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Discriminant validity

The measure is not related to things that it should not be related to

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Predictive

Assess whether a measure can accurately predict future behaviour

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A Priori

Consider the proposition, "If George V reigned at least four days, then he reigned more than three days." This is something that one knows a priori, because it expresses a statement that one can derive by reason alone

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A posteriori

Compare this with the proposition expressed by the sentence, "George V reigned from 1910 to 1936." This is something that (if true) one must come to know a posteriori, because it expresses an empirical fact unknowable by reason alone